AI DamageKawasaki EX300: problems, complaints, bulletins
Summary for the Kawasaki EX300 across 1 model years: 14 owner complaints and 0 NHTSA service bulletins, plus repair videos. Pick a year for details.
Model years
| Year | Owner complaints | involving a crash | Technical service bulletins (TSB) | YouTube repair videos |
|---|---|---|---|---|
| 2013 | 14 | 1 | 0 | 0 |
What fails most often
- 1 Engine 43% of all complaints
- 2 Fuel/propulsion system 36% of all complaints
- 3 Powertrain 29% of all complaints
- 4 Engine and cooling 14% of all complaints
- 5 Structure 14% of all complaints
- 6 Electrical system 7% of all complaints
- 7 Steering 7% of all complaints
- 8 Suspension 7% of all complaints
- Engine: 6 complaints (43% of all).
- Fuel/propulsion system: 5 complaints (36% of all).
- Powertrain: 4 complaints (29% of all).
- Engine and cooling: 2 complaints (14% of all), 1 of them with a crash reported by the owner.
- Structure: 2 complaints (14% of all), 1 of them with a crash reported by the owner.
Symptoms owners describe
How many of the 14 NHTSA complaints mention each symptom (automatic count from complaint text; one complaint can mention several).
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Engine | 6 | 0 | 0 |
| Fuel/propulsion system | 5 | 0 | 0 |
| Powertrain | 4 | 0 | 0 |
| Engine and cooling | 2 | 1 | 0 |
| Structure | 2 | 1 | 0 |
| Electrical system | 1 | 0 | 0 |
| Steering | 1 | 0 | 0 |
| Suspension | 1 | 0 | 0 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
I was going through a slight curve, not a big one just a normal curve going about 20 miles per hour when I tried to slow down the bike sort of stalled so I went straight into the curb into where I hit a tree. There are many people that saw e incident and found it very strange as well as I did.
The contact stated that while driving approximately 55 mph and decelerating to 35 mph, the handle bars would shake excessively. The contact took the vehicle to the dealer but no repairs were performed. The manufacturer was made aware of the failure. The failure mileage was 800.
Pulling in the clutch causes the rpms to drop below 1000 rpm causing the engine to die or stall. This happens frequently. It can occur several times in a row or it can be several days before it happens again. I've tried to increase idle speed to 2000 rpm, manufacturer recommends 1300, which did not help.
Purchased my ninja 300 3/25/13. Signs of first wobble due to poor head bearing was on 4/10/13. That's only 15 calendar days! My ninja 300 wobbles from decel from 50mph to 35mph.
The engine rpm's dropped lower than the idle speed and the engine stalled as the bike was still moving. I coasted to a stop. I placed the bike in neutral and restarted the motor. It started up fine and I continued on to an intersection where I attempted to make a u-turn.
When coming to a stop with clutch disengaged engine stalled and had to be restarted. Luckily no traffic was behind me or I might have hit from behind.
What to check before buying
- Engine. Cold start, unusual noises, oil leaks and engine codes.
- Fuel/propulsion system. Fuel smell, leaks, rough running, fuel-system codes.
- Powertrain. Shift quality under load, harsh shifts, transmission codes, CV joints.
- Engine and cooling. Radiator and fan after a frontal hit, coolant level and condition, overheating.
Other models of this make
Read also
Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-06.